Looks good and from your description, it sounds like you coded things well, too.

Since you have the vertical holding fixture, box joints should be just as easy, if not easier than the dovetails to accomplish and that "repeatability" thing is nice. The same limitation applies with sizes, however...it's all about the tooling. You can do narrow box joints on thinner material no problem with, say...a .125" end mill, but there will be increased risk doing that with thicker material because of the limitations on LOC (length of cut) for the tooling and heat generated when paases get beyond that LOC as you step down for each pass.